Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 1: Opera mechanica

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249159HOROLOG. OSCILLATOR. ex B, centro circuli ſui, fit pendulum ipſi iſochronum {3 pr/4b},
11De centro
OSCILLA-
TIONIS.
hoc eſt, trium quartarum rectæ, quæ ſit ad radium B F ut
arcus
C F D ad ſubtenſam C D.
Hæc autem inveniuntur
cognitis
ſubcentricis cuneorum;
tum illius qui ſuper ſectore
toto
abſcinditur, plano ducto per B K parallelam ſubtenſæ
C
D, cujus cunei ſubcentricam ſuper B K invenimus eſſe
{3/8} y - {3/8} a + {3 p r/8 b}, vocando a ſinum verſum E F;
tum illius.
qui ſuper dimidio ſectore B F C abſcinditur plano per
B
F, cujus nempe cunei ſubcentricam ſuper B F invenimus
{3/8} b - {3 b r/8 a} + {3 p r/8 a}.

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